/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "flutter/sky/engine/core/rendering/OrderIterator.h"

#include "flutter/sky/engine/core/rendering/RenderBox.h"

namespace blink {

OrderIterator::OrderIterator(const RenderBox* containerBox)
    : m_containerBox(containerBox), m_currentChild(0), m_isReset(false) {}

RenderBox* OrderIterator::first() {
  reset();
  return next();
}

RenderBox* OrderIterator::next() {
  do {
    if (!m_currentChild) {
      if (m_orderValuesIterator == m_orderValues.end())
        return 0;

      if (!m_isReset) {
        ++m_orderValuesIterator;
        if (m_orderValuesIterator == m_orderValues.end())
          return 0;
      } else {
        m_isReset = false;
      }

      m_currentChild = m_containerBox->firstChildBox();
    } else {
      m_currentChild = m_currentChild->nextSiblingBox();
    }
  } while (!m_currentChild ||
           m_currentChild->style()->order() != *m_orderValuesIterator);

  return m_currentChild;
}

void OrderIterator::reset() {
  m_currentChild = 0;
  m_orderValuesIterator = m_orderValues.begin();
  m_isReset = true;
}

OrderIteratorPopulator::~OrderIteratorPopulator() {
  m_iterator.reset();
}

void OrderIteratorPopulator::collectChild(const RenderBox* child) {
  m_iterator.m_orderValues.insert(child->style()->order());
}

}  // namespace blink
